Synthesis and comprehensive analysis of luminescent dysprosium (III) complexes: Photoluminescence, thermal behavior and electrochemical properties

• Published in: Polyhedron 2024-10, Vol.261, p.117146, Article 117146
• Main Authors: Redhu, Sonia, Singh, Devender, Dalal, Swati, Malik, Sofia, Aggarwal, Vandana, Hooda, Anjli, Kumar, Sumit, Malik, Rajender Singh, Kumar, Parvin
• Format: Article
• Language: English
• Subjects: Dy (III) complexes; Luminescence; NMR; Photochemistry; Synthesis; Tauc’s plot; Yellow-emission
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2024.117146

[Display omitted] •Synthesized ternary Dy(III) complexes utilizing 1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedione and 1,10-phenanthroline derivatives.•Noticeable dipolar paramagnetic shifts in 1H NMR.•Conducted photoluminescence analysis to reveal impact of various neutral ligands on the luminosity.•Hyperintense electric dipole peak at 575 nm (ΔJ=2), attributed to asymmetry in complexes, is responsible for yellow emission.•Correlation of band gap data derived from electronic spectra and voltammetry for D1-D4 indicates their potential application in semiconductor devices. The diketone 1,1,1–trifluoro–5,5–dimethyl–2,4–hexanedione was used to prepare eight–coordinated ternary dysprosium (III) complexes, namely, [Dy(TDH)3Phen] (D1), [Dy(TDH)3P1] (D2), [Dy(TDH)3P2] (D3) and [Dy(TDH)3P3] (D4) employing an in-situ approach. From FT–IR and 1H NMR, it is suggested that dysprosium (III) ion is coordinated with three diketone moieties through oxygen atom and one neutral moiety via nitrogen atom. In the photoluminescence (PL) emission spectrum of Dy3+ complexes, well–defined peaks were obtained at around 480 nm, 575nm and 660 nm due to 4F9/2 → 6HJ (J=15/2, 13/2 and 11/2). Color parameters obtained from the emission spectra indicate that the synthesized complexes emit a yellow color primarily due to ΔJ=2 transition. All the synthesized complexes are characterized by a single luminescent centre, as evidenced by monoexponentially fitted decay profiles.